Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 108 for “"harsh environment"”.
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Microcantilever Based Potentiometric Sensors For Harsh Environment Applications
… HFET was designed and fabricated targeting harsh environment operation. The piezoresistive and piezoelectric properties of AlGaN/GaN heterostructure is highly attractive for harsh environment applications of microelectromechanical systems (MEMS) sensors. This is because it can cause large …
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Sapphire Based Fiber-Optic Sensing for Extreme High Temperatures
… and needed sensing technique, especially in harsh environment like a coal gasifier or an airplane engine. Single crystal sapphire has been studied in the last two decades as a candidate for harsh environment sensing task, due to its excellent mechanical and optical properties under extreme …
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High temperature tolerant optical fiber inline microsensors by laser fabrication
"Fiber sensors are particularly attractive for harsh environment defined by high temperature, high pressure, corrosive/erosive, and strong electromagnetic interference, where conventional electronic sensors do not have a chance to survive. However, the key issue has been the robustness of the …
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Fiber inline pressure and acoustic sensor fabricated with femtosecond laser
… noise and limited space in such environments. Fiber optic sensors have been developed since the last century and have proved themselves good candidates in such harsh environment. This dissertation aims to design, develop and demonstrate miniaturized fiber pressure/acoustic sensors …
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Novel Optical Sensors for High Temperature Measurement in Harsh Environments
… processes. Many of these processes involve harsh environments, such as high temperature, high pressure, chemical corrosion, toxicity, strong electromagnetic interference, and high-energy radiation exposure. These extreme physical conditions often prevent conventional temperature sensors from …
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Wavelength agnostic WDM strategies for avionic telecommunications
… (PONs) and how the network is affected by the harsh environment found on aircraft. The harsh environment presents a particular challenge with respect to the operational temperature range. Over this range it is desirable to minimise any additional weight and power consumption associated with …
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Application of a Fabry-Perot interferometer for measuring machining forces in turning operations
… A robust sensor must be made to withstand the harsh environment of machining. Also a method for eliminating the affects of thermal strain must be created. Finally, the placement of the FP sensor must also be determined. The FP has the potential to effectively monitor machining forces without …
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Optical Frequency Domain Reflectometry Based Quasi-distributed High Temperature Sensor
Temperature sensing in harsh environment is desired in many areas, such as coal gasification, aerospace, etc. Single crystal sapphire is an excellent candidate for construction of harsh environment sensors due to its superior mechanical and optical properties even at temperature beyond 1600°C. The …
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Mode Volume Reduction in Single Crystal Sapphire Optical Fibers
… of current fiber optic sensors in the harsh environment and potentially enable those that are limited by the optical property of unclad single crystal sapphire optical fiber (SCSF).
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Active Measurement of a Micron-Order Gap Under High-Speed and High-Temperature Conditions
… to act as a protective barrier between the harsh environment and surface materials of these flight bodies. The mechanical operation of a portable hypersonic simulation device was developed in-house and tested at Argonne National Laboratories (ANL) to gather in-situ material response of …
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Ultra-wideband radar for robust inspection drone in underground coal mines
… inspection drone must be highly robust to the harsh environment of an underground coal mine, with high levels of coal dust and humidity that can obstruct many conventional sensing methods. For high functionality, the drone must sense and avoid potential obstacles and as well as inspect and map …
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DESIGN, COMPACT MODELING AND CHARACTERIZATION OF NANOSCALE DEVICES
… at very high power, high speed and under harsh environment, where CMOS cannot compete. Another type of devices that have the potential to complement CMOS transistors are nano-electromechanical systems (NEMS), with potential applications in filters, stable frequency sources, non-volatile …
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Application of Machine Learning in Failure Prediction of Brazed-Aluminum Based Heat Exchangers
… are subject to a uniquely stressful and harsh environment that involves large thermal stresses due to steady-state and transient thermal loads, mechanical loads, contaminants, corrosion and exposure to low temperatures. Despite careful design for unlimited life, several pre-mature …
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Measurement of linear position using a magnetostrictive wire
… In addition it was to be able to operate in a harsh environment (e.g. underwater) where alternative devices would not function. While an accuracy objective was not established, it was hoped to be able to push accuracy near to the theoretical resolution. A. prototype measuring device was …
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On-orbit serviceability of space system architectures
… during the stress of launch and degrade in the harsh environment of space. On-orbit servicing offers satellite operators an option for maintaining or improving space-based capabilities without launching a new spacecraft. Numerous studies have been performed on on-orbit servicing, particularly …
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Development of a Miniature, Fiber-optic Temperature Compensated Pressure Sensor
… (such as temperature and pressure) in extremely harsh environment is one of the most intriguing challenges of this field, and is highly valued in the automobile industry, aerospace research, industrial process monitoring, etc. [2]. Although the semiconductor based sensors can operate at around …
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Single Crystal Sapphire Photonic Crystal Fibers
… experiments. The fibers were then exposed to a harsh environment of 1000 °C with a coating of alumina to test the resistance to scattering of the fiber. The fibers were also examined using materials characterization equipment to see how the harsh environments impacted the optical and mechanical …
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Mechanical characterization of aged recycled polymers and applications
… strength after 18 months of aging under harsh environment (60 years in practice).;Offset block modules for highway guardrail systems were manufactured with recycled ABS and discarded rubber tires. Reinforced recycled plastic shapes were evaluated as possible post and rail for highway …
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